<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            padding: 0;
            margin: 0;
        }
        body{
            /* display: flex; */
            justify-content:center;
            align-items:center;
            min-height: 100vh;
            width: 100vw;
        }
        .circle1 {
      /* width: 100px;
      height: 50px;
      border-radius: 50px 50px 0 0;
      line-height: 50px;
      border: 1px solid;
      border-bottom-color: transparent; */
      width: 100px;
    height: 200px;
    border: 1px solid black;
    border-radius: 100% 0 0 100%/50%;
    border-right: none;
    background-color:transparent;
    }
    </style>
</head>
<body>
 <div class="circle1"></div>
</body>
</html>